The next step in treating whatever Belly Button Ring is going on is to make sure your jewelry is up to snuff. Are your studs, hoops, or CBR's (captive bead rings) made of surgical stainless steel, surgical titanium, niobium, or Tygon (a surgical plastic)? If you're not sure, visit your local trusted professional piercing studio. They will help you select a quality item in the perfect gauge for healing your piercing. They'll often change it out for you, too, so there's no reason to do it yourself. Then once it's in, surgical steel nose ring leave it there until your bump is completely healed.
Rotate it occasionally if possible, but only after healing.